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Advanced Application of Flywheels Cory Markham

Advanced Application of Flywheels Cory Markham. Components of a flywheel energy storage system. Rotor : spinning mass that stores energy B earings: pivots on which the rotor rests M otor-generator: converts mechanical energy into electrical energy or vise versa

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Advanced Application of Flywheels Cory Markham

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  1. Advanced Application of FlywheelsCory Markham

  2. Components of a flywheel energy storage system • Rotor: spinning mass that stores energy • Bearings: pivots on which the rotor rests • Motor-generator: converts mechanical energy into electrical energy or vise versa • Power electronics: inverter and rectifier that convert raw electrical power into conditioned electrical power • Controls/instrumentation: monitors and controls the flywheel system to ensure that the system is running at the given parameters • Housing: Containment around the flywheel system. Can also be used to maintain a vacuum.

  3. Background of Flywheel • Storage of kinetic energy • Past application have used standard mechanical bearing that have high losses due to friction. • Boeing will combat loss using the patented high-temperature superconducting (HTS) magnetic non contact bearing system.

  4. Background Continued • Advantages • Fast power response • High cycle life • Short recharge time • High specific energy • Disadvantages • Complex low loss bearings • Fatigue limits • Short discharge time • Current material limits of 800m/s tip speed

  5. Boeing ARPA-E Flywheel Project • Use a combination of advanced fiber technology and HTS bearing to develop a low cost and high efficiency flywheel energy storage system. • Their goal is have a high enough rotor speed that will have a projected energy value of $100/kW-h • Material prototypes will produce 7kWh for scaling purposes up to a utility size flywheel (100kW-h) • Their vision is to develop an array of the 100kW-h flywheels in an array to allow for a storage capacity of 2 MW-h fro utility applications

  6. Other Applications of Flywheel for space crafts • Reaction wheel: used primarily by spacecraft for attitude control without using fuel for rockets or other reaction devices. This is accomplished by equipping the spacecraft with an electric motor attached to a flywheel which, when its rotation speed is changed, causes the spacecraft to begin to counter-rotate proportionately. • Momentum wheel:operates it at a constant (or near-constant) rotation speed, in order to imbue a satellite with a large amount of stored angular momentum. Doing so alters the spacecraft's rotational dynamics so that disturbance torques perpendicular to one axis of the satellite  • Control moment gyro (CMG): Applying a constant torque to the on the mounted wheel causes the spacecraft to develop a constant angular velocity about a perpendicular axis. CMGs are generally able to produce larger sustained torques than RWs and are preferentially used in larger spacecraft, including Skylab and the International Space Station.

  7. Aviation design • The Electromagnetic Aircraft Launch System (EMALS) is designed to replace steam catapult system currently used on U.S. Navy aircraft carriers. • Gerald R. Ford (CVN 78) is the first carrier to use EMALS.  John F. Kennedy (CVN 79) is the next carrier scheduled to install and use EMALS. • Four rotors will store 121 MJ at 6400 rpm. They can store 122 MJ in 45 secs and release it in 2–3 seconds. The flywheel energy densities are 28 kJ/kg; including the stators and cases this comes down to 18.1 kJ/kg, excluding the torque frame.

  8. NASA uses Flywheels • it used a carbon fiber rim with a titanium hub designed to spin at 60,000 rpm, mounted on magnetic bearings. • Storage was 525 W-hrand could be charged/discharged at 1 kW. • Demonstrations were conducted at Glenn to show simultaneous energy storage and momentum control using two high-speed magnetically levitated flywheels.

  9. Bibliography • https://upload.wikimedia.org/wikipedia/commons/f/f5/Blender3D_KolbenZylinderAnimation.gif • http://large.stanford.edu/courses/2010/ph240/haefele1/ • http://www.climatetechwiki.org/technology/jiqweb-es-fw • http://www.grc.nasa.gov/WWW/portal/pdf/flywheel.pdf • https://www.uaf.edu/files/acep/BoeingFlywheelOverview_06_20_2012.pdf • https://www.quora.com/How-is-Flywheel-used-in-spacecraft-navigation-and-guidance-system • http://www.ga.com/emals

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